signature.c: fix off-by-one error

Signed-off-by: schu <schu-github@schulog.org>

src/signature.c

@@ -62,7 +62,7 @@ static int process_trimming(const char *input, char **storage, const char *input
 	left = skip_leading_spaces(input, input_end);
 	right = skip_trailing_spaces(input, input_end - 1);
 
-	if (right <= left) {
+	if (right < left) {
 		if (fail_when_empty)
 			return git__throw(GIT_EINVALIDARGS, "Failed to trim. Input is either empty or only contains spaces");
 		else

tests/t04-commit.c

@@ -478,6 +478,31 @@ BEGIN_TEST(signature1, "can not create a signature with empty name or email")
 	must_fail(try_build_signature("nulltoken", "  ", 1234567890, 60));
 END_TEST
 
+BEGIN_TEST(signature2, "creating a one character signature")
+	git_signature *sign;
+	sign = git_signature_new("x", "foo@bar.baz", 1234567890, 60);
+	must_be_true(sign != NULL);
+	must_pass(strcmp(sign->name, "x"));
+	must_pass(strcmp(sign->email, "foo@bar.baz"));
+	git_signature_free((git_signature *)sign);
+END_TEST
+
+BEGIN_TEST(signature3, "creating a two character signature")
+	git_signature *sign;
+	sign = git_signature_new("xx", "x@y.z", 1234567890, 60);
+	must_be_true(sign != NULL);
+	must_pass(strcmp(sign->name, "x"));
+	must_pass(strcmp(sign->email, "foo@bar.baz"));
+	git_signature_free((git_signature *)sign);
+END_TEST
+
+BEGIN_TEST(signature4, "creating a zero character signature")
+	git_signature *sign;
+	sign = git_signature_new("", "x@y.z", 1234567890, 60);
+	must_be_true(sign == NULL);
+END_TEST
+
+
 /* External declaration for testing the buffer parsing method */
 int commit_parse_buffer(git_commit *commit, void *data, size_t len, unsigned int parse_flags);
 
@@ -758,4 +783,7 @@ BEGIN_SUITE(commit)
 
 	ADD_TEST(signature0);
 	ADD_TEST(signature1);
+	ADD_TEST(signature2);
+	ADD_TEST(signature3);
+	ADD_TEST(signature4);
 END_SUITE